Accessibility questions

[chordatesrock]

I have no fail to report (unless you count the existence of a building with stairs and no elevator, but you've seen that a million times), but I do have a question about how to not fail. Actually, I have a few questions, and they're specifically about accessibility for blind and VI internet users.

I understand that image descriptions are necessary, and that links should have descriptive text or clarifying title text. If anyone here personally uses these accessibility features, could you clarify some things for me?

( Questions under the cut )